MAC Address Lookup
Need to work out what a device is on your network? Paste a MAC address (or OUI prefix) and we’ll show the registered manufacturer straight away, using the OUI database.
You’ll also get the vendor prefix and address classification (locally administered vs globally assigned, unicast vs multicast where applicable) to help with troubleshooting and network audits.
Private: everything runs locally in your browser – no MAC addresses are transmitted or saved.
MAC Address / OUI Lookup
About OUI lookups
The first 24 bits (3 octets / 6 hex characters) form the OUI. This identifies the organisation that registered the prefix.
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Tip: if you only have the prefix from logs (e.g., AABBCC), paste just that.
Device Information
Knowing the device is one thing. Knowing what it’s doing is another.
A MAC address or OUI lookup helps identify what a device is and where it came from. But it doesn’t show behaviour - what it’s connecting to, how it’s being used or whether something looks out of place.
Most issues don’t start with unknown devices. They start with normal devices doing something unusual that no one spots in time.
We support businesses across Chesterfield and Sheffield without in-house IT - keeping an eye on activity across devices, logins, and networks, and stepping in when something doesn’t look right.
Cyber security for Chesterfield & Sheffield businesses